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Mission Operations Days: 2001/237 to 2001/243
August 25, 2001 00:00:00 GMT to August 31, 2001 00:00:00 GMT

Terra Spacecraft and MODIS Instrument Status:

Terra (AM-1) is in Normal Ops Mode
MODIS is in Science Mode - A Side
Component State(s) Comment
Blackbody A On (290 K); B Off Nominal
Calibration Electronics A On; B Off Nominal
Control Processor A On; B Off Nominal
Nadir Door Unlatched, Open Nominal
Space View Door Unlatched, Open Nominal
Solar Diffuser Door Unlatched, Closed Nominal
FDDI Formatter A On; B Off Nominal
FDDI Port A On; B Off Nominal
FIFO Memory #1 & #2 On; #3 & #4 Off Nominal
Format Processor A On; B Off Nominal
Power Supplies #1 On; #2 Off Nominal
PV VIS FPA A On; B Off Nominal
PV NIR FPA A On; B Off Nominal
PV SMIR FPA A On; B Off Nominal
PV LWIR FPA A On; B Off Nominal
PC LWIR FPA A On; B Off Nominal
RC Outgas Heaters All Off (CS, IS, OS) Nominal
RC LWIR FPA Heater On (83 K) Nominal
RC SMIR FPA Heater Off Nominal
Scan Assembly A On; B Off Nominal
SDSM A Off; B Off Nominal
SRCA A Off; B Off Nominal
PS1 Survival Heater Enabled Nominal
PS2 Survival Heater Enabled Nominal
Timing Generator A Off; B On Nominal
Flight Software Rev BD + 2 set of patches
  • FR Error Counting and Statistics (2 patches)
  • FR Band 5 Gain Change (20 commands)
Inhibit Ids Set None Nominal
TMON 66 (SRCA A) Disabled Nominal
TMON 67 (SRCA B) Disabled Nominal
TMON 68 (FIFO) Enabled Nominal
TMON 69 (EPS Current) Disabled Nominal

This Week's Completed MODIS Activities:

Saturday, August 25, 2001


Sunday, August 26, 2001


Monday, August 27, 2001


Tuesday, August 28, 2001


Wednesday, August 29, 2001

2001/241 20:21:04 ATC OA-16: SD/SDSM Screened
2001/241 21:59:57 ATC OA-15: SD/SDSM Open

Thursday, August 30, 2001


Friday, August 31, 2001


This Week's Scheduled MODIS Activities Not Completed:

The formatter memory loads were not performed to clear the existing error addresses/counts.

Upcoming MODIS Events:

Friday, August 31, 2001


Saturday, September 1, 2001


Sunday, September 2, 2001


Monday, September 3, 2001


Tuesday, September 4, 2001

Anticipated day to perform memory load to clear FR error/count buffers

Wednesday, September 5, 2001

Two orbits with SMIR Itwk/Vdet of 79/110
SD/SDSM calibrations

Thursday, September 6, 2001


Friday, September 7, 2001



The next Lunar Calibration roll maneuver is scheduled for day 2001/250 (September 7, 2001) with data collection from 20:03:47 to 20:10:17. The roll angle will be -7.5106 degrees.

MODIS Anomalies:

The rate of formatter “error events” has increased during the past week to approximately 60-120 per day. There still have not been any noticeable impacts to operations.

General Instrument Comments:

MODIS is in Science Mode on the A-side with the SVD and NAD open, operating with the Formatter Resolution Flight Software Patches (FRFSP).

Note: SD/SDSM calibrations were planned to be reduced to once per two weeks. This plan has been revised; SD/SDSM calibrations will continue to be scheduled once each week until the end of November.

MODIS Telemetry Trends:

Trending has resumed with the instrument on the A-side. With the currently decreasing beta angle, the amount of focal plane heater margin is increasing. The intermediate stage cooler temperature is stable.

Non-MODIS Significant Events:


Limited Life Item Status:

SRCA 10W Lamp #1: 189.1 of 500 hours
SRCA 10W Lamp #2: 144.8 of 500 hours
SRCA 10W Lamp #3: 154.0 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours

SRCA 1W Lamp #1: 558.0 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours

Solar Diffuser Door: 1691 of 3022 Movements
Nadir Aperture Door: 532 of 1316 Movements
Space View Door: 437 of 1316 Movements